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Many thanks to Frank Dihartce for sharing pictures of his April 8, 1968 dated crossram with us. Frank tells me thathe believes this is the earliest casting date that was made available through the Chevy parts department for purchaseby the general public. These April manifolds still had the provision for the oil shield on the underside on the bottomhalf of the manifold. Frank's manifold is using the LIST-4295 carburetors but I think GM was still using the LIST-4210Acarburetors in April '68.

Here's another crossram from the Frank Dihartce Collection. This is what Frank has to say about it...

"This is another crossram 4.8.68 dated setup I bought. It is stamped KL RACING on the front runner, and came with two 4295 Holley carbs 891 dated, fuel block with four lines and one hose nipple, oil splash shield, oil fill tube, and water neck. The manifold lid has no date which is consistent with the other 4.8.68 unit I had, and the manifold bottom is exactly the same as my other 4.8.68 unit."

Thanks, Steve. You could run aftermarket manifolds starting in 1971 but by then the 2x4 manifolds had been disallowed. Camaros were only able to use the GM crossram in '68 and '69 then they had to go to the single 4-bbl manifold in 1970.

Thanks Jon, great info! So given the prices commanded for the GM manifolds, and their scarcity (as I say that there appear to be two of them on ebay as I write this), are HTA car owners running 1968/69 cars allowed to fit either the Offenhauser or Edelbrock intakes or can they only fit the GM intake, as per the period?